Foliation.. of course!
foliation
An arrangement of minerals in flat, wavy, or parallel bands is known as a banded structure or banding. This structure is commonly seen in rocks like gneiss and schist, where different minerals align in layers or bands due to geological processes like metamorphism. The distinct bands are often a result of alternating composition or texture variations within the rock.
This arrangement is known as foliation, commonly seen in metamorphic rocks where minerals align in layers due to pressure and temperature changes during their formation.
foliation
Flat or wavy parallel bands on metamorphic rocks are typically a result of foliation, which occurs due to the alignment of mineral grains under directed pressure during metamorphism. This process causes minerals, such as mica or chlorite, to realign and form layers or bands that are either flat or wavy. The texture and pattern can provide insight into the conditions of metamorphism, including the degree of pressure and temperature the rock experienced. These features are often seen in schist and gneiss, among other metamorphic rocks.
A cylinder has 2 flat, parallel faces.
Parallel alignment of platy grains refers to the orientation of flat, thin particles, such as clay minerals or mica, in a sedimentary or metamorphic rock. This alignment typically occurs due to directional pressure or shear forces during the formation process, resulting in a fabric that can influence the rock's physical properties, such as permeability and strength. It is often observed in schist and other foliated rocks, where the parallel arrangement enhances the rock's ability to split along specific planes.
A mineral's ability to split along flat surfaces is called cleavage. Cleavage is a characteristic property of minerals related to their crystal structure and internal arrangement of atoms.
Minerals do have zones of weakness. They are known as cleavage planes. It is the tendency for minerals to break along flat, parallel surfaces. They come in a variety of categories, but it is ultimately where the mineral will break if struck. It cal be basal, prismatic,cubic, rhombohedral, octahedral, or dodecahedral.
In science, cleavage refers to the way in which a mineral breaks along certain planes due to its atomic structure. It results in smooth, flat surfaces that are often parallel and reflective of the internal arrangement of atoms within the mineral. Cleavage is one of the properties used to identify minerals.
On a flat Euclidean surface, parallel lines cannot meet. On a sphere, parallel lines CAN meet.
This process is called cleavage and is a property of minerals. Minerals with cleavage break along planes of weakness into smooth, flat surfaces that reflect light. Cleavage is a result of the arrangement of atoms within the mineral, and the number and orientation of cleavage planes can vary between different minerals.